well, they would have to admit to themselves that they have been wrong.
If there is a gram of stubbornness in a person this is the hardest thing ever to do.
If they are self righteous then it is impossible.
If their life has been circled by meetings, getting ready for, attending, the convo after the very ritual of meetings and they have no other event in their lives like a creative hobby, music playing or listening, some sport, perhaps some further education courses and so on then they haven't a snow ball in hells chance of leaving.
Add to this as they have gotten older they will probably seen loved ones pass-away so the chance of ever seeing them again is welded into the wt influence and that alone.
Utterly tragic ..........